first

1 first /ˈfɚst/ adjective
1 first
/ˈfɚst/
adjective
Britannica Dictionary definition of FIRST
1 
: coming before all others in time, order, or importance
2 
— used to refer to the lowest forward gear or speed of a vehicle
3 
: having or playing the main part in a group of instruments

at first blush

or at first glance also at first sight
: when first seen or considered

at first hand

: in a direct way : firsthand

first among equals

◊ A person who is first among equals is the leader of a group of people but is officially considered equal in rights and status to the other members of the group.

first thing

1 
the first thing : anything at all — used in negative statements
2 
: before anything else : right away : very early

first things first

— used to say that you should do the things that are most important before doing other things

in the first flush of

— see 1flush

in the first instance

— see instance

in the first place

— see 1place

love at first sight

— see 1love
2 first /ˈfɚst/ adverb
2 first
/ˈfɚst/
adverb
Britannica Dictionary definition of FIRST
1 
a  : before any other in time, order, or importance
b  : for the first time
c  : before doing other things
2 
— used to introduce a statement that is the first in a series of statements
— often used in the phrases first of all and first off

come first

: to be more important than other things

first and foremost

: at the most basic level

first and last

: at the most basic level : in all respects

first come, first served

or first come, first serve
— used to say that the people who arrive earliest get served or treated before the people who arrive later
3 first /ˈfɚst/ noun
plural firsts
3 first
/ˈfɚst/
noun
plural firsts
Britannica Dictionary definition of FIRST
1 
: something that is first: such as
a  [count] : an occurrence, achievement, etc., that happens or exists before any other of that kind
b  [noncount] : the position of the winner in a competition or contest
c  [noncount] : the lowest forward gear or speed of a car, truck, etc.
d  [count] : a degree of the highest level from a British university
2 
[noncount] baseball : first base

at first

: when something first happens or begins to happen : when you first notice or consider something

from the first

: from the beginning
4 first /ˈfɚst/ pronoun
4 first
/ˈfɚst/
pronoun
Britannica Dictionary definition of FIRST
1 
: the first one or ones
2 
: the first time